The exodermis is a physiological barrier that has a role in root function and protection.[1] The exodermis is a membrane of variable permeability responsible for the radial flow of water, ions, and nutrients.[2][3] It is the outer layer of a plant's cortex.[1][4] The exodermis serves a double function as it can protect the root from invasion by foreign pathogens and ensures that the plant does not lose too much water through diffusion through the root system and can properly replenish its stores at an appropriate rate.[5]
A cross-section through Orchid mycorrhiza's
Exodermis (Ri)
Epidermis (Ep)
Passage cells (Dz)
Living hyphae (Hy)
Degenerate hyphae (dHy)
Bark cells (Rz)
v
t
e
^ abEnstone DE, Peterson CA, Ma F (2002-12-01). "Root Endodermis and Exodermis: Structure, Function, and Responses to the Environment". Journal of Plant Growth Regulation. 21 (4): 335–351. doi:10.1007/s00344-003-0002-2. ISSN 1435-8107. S2CID 5033995.
^Evert RF, Eichhorn SE (2013). "Raven Biology of Plants". doi:10.1007/978-1-319-15626-8 (inactive 2024-04-10). ISBN 978-1-4641-1351-2.{{cite book}}: CS1 maint: DOI inactive as of April 2024 (link)
^Hose E, Clarkson DT, Steudle E, Schreiber L, Hartung W (2001-12-01). "The exodermis: a variable apoplastic barrier". Journal of Experimental Botany. 52 (365): 2245–64. doi:10.1093/jexbot/52.365.2245. PMID 11709575.
^Peterson CA, Perumalla CJ (1990-06-07). "A survey of angiosperm species to detect hypodermal Casparian bands. II. Roots with a multiseriate hypodermis or epidermis". Botanical Journal of the Linnean Society. 103 (2): 113–125. doi:10.1111/j.1095-8339.1990.tb00177.x.
^Cite error: The named reference :4 was invoked but never defined (see the help page).
The exodermis is a physiological barrier that has a role in root function and protection. The exodermis is a membrane of variable permeability responsible...
surrounded by a cortex which is further enveloped by a highly specialized exodermis, most of which at maturity do not contain protoplasm. A few cells, however...
have been shown to be involved in gravitropism in some plants. Suberin Exodermis Epidermis Rost, Thomas L.; Michael Barbour; C. Ralph Stocking; Terence...
Myxobolus cerebralis Cells found in mesoglea No Yes Yes Yes Nematocysts in exodermis No Yes Yes Yes Medusa phase in life cycle In some species Yes Yes No Number...
SOBRALIA MACRANTHA (ORCHIDACEAE): STRUCTURE AND FUNCTION OF THE VELAMEN‐EXODERMIS COMPLEX". American Journal of Botany. 69 (4): 608–614. doi:10.1002/j.1537-2197...
endodermis and Casparian strip of visible vascular bundles Suberin Endodermis Exodermis After the endothelial cell wall in the old root forms a wood embolism...
"Environmental effects on the maturation of the endodermis and multiseriate exodermis of Iris germanica roots". Annals of Botany. 103 (5): 687–702. doi:10.1093/aob/mcn255...
are expressed in roots, on the plasma membranes of cells in both the exodermis and the endodermis. In contrast to Lsi1, which is localized on the distal...
"Environmental effects on the maturation of the endodermis and multiseriate exodermis of Iris germanica roots". Annals of Botany. 103 (5). Botanical Society...
the thin rhizodermis (root bark) there is a clear one-celled layer of exodermis, with a thickened inner tangential cell wall containing layers of suberin...
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